| Assertion (A): | In the absence of fertilization, the corpus luteum degenerates. |
| Reason (R): | The degeneration of the corpus luteum causes disintegration of the endometrium, leading to menstruation and marking the start of a new cycle. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |